All things related to multicast

[Marshall Eubanks <>]

We (AS 16517) see the source ip address

multicasttech-1>show ip mbgp 193.146.115.212
BGP routing table entry for 193.144.0.0/14, version 25156
Paths: (2 available, best #2, table NULL)
Flag: 0x208
  Advertised to non peer-group peers:
  63.251.101.52
  1239 11537 20965 766
    160.81.38.225 from 160.81.38.225 (144.228.242.54)
      Origin IGP, metric 116, localpref 100, valid, external
  145 11537 20965 766
    0.0.0.0 from 166.61.8.89 (204.147.128.136)
      Origin IGP, localpref 100, valid, external, best
      Community: 9503719 756091333 1373962395 1373969300


but not the msdp SA's

multicasttech-1>show ip msdp sa | include 227.142.142.3
multicasttech-1>

and mtrace is not very happy

multicasttech-1>mtrace
Source address or name: 193.146.115.212
Destination address or name: 63.105.122.133
Group address or name: 227.142.142.3
Multicast request TTL [64]:
Response address for mtrace:
Type escape sequence to abort.
Mtrace from 193.146.115.212 to 63.105.122.133 via group 227.142.142.3
From source (?) to destination (off-mct2.multicasttech.com)
Querying full reverse path... * switching to hop-by-hop:
 0  off-mct2.multicasttech.com (63.105.122.133)
-1  * * * Timed out receiving responses
Perhaps no local router has a route for source, the receiver is not
a member of the multicast group or the multicast ttl is too low.

multicasttech-1>


However, we do see _some_ msdp SA's from AS 766, as does Nordunet

http://www.nordu.net/connectivity/looking-glass/lg.cgi

So, it doubtful that you have a msdp black hole. Are you sure that the
multicasts are actually being sourced at the present time ? Let me know
when you are sure they are being sourced, and we will try and get them here.

It would be useful if the multicast beacon could be brought up at both
AS 766 and at your location.

http://dast.nlanr.net/Projects/beacon/

Regards
Marshall Eubanks

Arturo Lev Servin wrote:
> Hi,
>
>     We are supposed (Tec de Monterrey, Mexico) to recieve a multicast 
> session from Spain. In Spain they recieve the multicast session with out 
> problem between the Spanish Universitues. In Mexico I can see and 
> recieve the session from Oregon for example, but not from the Spanish.
>
>     I suppose that there is not multicast connectivity between Geant and 
> Iris (European and Spainish networks) or between Abilene and Geant.
>
>     Any body knows if between Abilene and Geant exist multicast 
> connectivity?
>
>     The multicast group they gave me is: (193.146.115.212, 227.142.142.3)
>
>     Another thing is that we have asymetric path in unicast. My unicast 
> traffic goes from CUDI (Mexico) to VBNs to Abilene to geant. From Spain 
> they go to Geant to Abilene and then directly to CUDI without passing 
> VBNs. Could be this asymetric path another problem?
>
> Thanks in advance,
> -as


--
                                 Regards
                                 Marshall Eubanks

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T.M. Eubanks
Multicast Technologies, Inc
10301 Democracy Lane, Suite 410
Fairfax, Virginia 22030
Phone : 703-293-9624       Fax     : 703-293-9609
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